int redLED = 22;    
int greenLED = 23;  
int blueLED = 21;
int purpleLED = 2;
int yellowLED = 13;
int pinkLED = 16;
int skyblue = 6;
int white = 18;

void setup() {
  pinMode(redLED, OUTPUT);
  pinMode(greenLED, OUTPUT);
  pinMode(blueLED, OUTPUT);
}

void loop() {
  // Blink the red LED
  digitalWrite(redLED, HIGH);
  delay(500);
  digitalWrite(redLED, LOW);
  delay(500);
  digitalWrite(greenLED, LOW);
  digitalWrite(blueLED, LOW);
  digitalWrite(purpleLED, LOW);
}